should a bisqued piece be glazed before making a plaster mold from it?

what do people use as a mold release? ive used murphys oil soap and i really dont like it.

A use a mold release from Laguna clay co-I can go check out the name-Its purelube-I buy the gallon size.Green soap from a drug store works just as well.I know folks lacquer them as well to seal then soap themSealing them first works the best then use the release agent or soap just before pouring in the plaster.Mark